They’re counterintuitive but they work.
A recent study found that sitting in a 105 degree bathtub (imagine: just below scalding) after a treadmill workout six days in a row helped athletes slice time off a 5K. The superhot water trains your body to deal with heat in real time.
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2. Overdress yourself
Wearing layers during your gym workouts (or when it’s mild outside—say, low 70s) also teaches your body to embrace a higher core temp, which you’ll face outdoors. Pile on enough so that you’re sweaty within five to 10 minutes of your workout, then call it quits after 30. (Stop if you feel dizzy or your heart is racing.)
3. Hang out in the steam room.
The moisture helps adjust your body to humidity. (The H word can doubly kill your energy because it causes you to lose more water via sweat.) Training in a dry climate? Hit the sauna for dry heat.
Source: Christopher Minson, Ph.D., professor of human physiology, University of Oregon, and codirector, Exercise & Environmental Physiology Lab
Runner’s World Gear Editor Jeff Dengate shows you how to keep your water bottle cool for those hot summer long runs.